Radium- $221$ Has a Half-Life Of $30 \mathrm {~s}$ Suppose We Have A Of 30

question 78

Essay

Radium- $221$ has a half-life of $30 \mathrm {~s}$ . Suppose we have a $300 \mathrm {~g}$ sample.
(a) Find a formula for the mass remaining after $t$ seconds.
(b) How much of the sample remains after $200$ seconds?
(c) After how long will only $20 \mathrm {~g}$ remain?

Understand the role of temperament in emotional responses and behavior.

Identify factors influencing emotion development, such as parental stress and cultural differences.

Comprehend the importance of goodness of fit between a child’s temperament and their environment.

Recognize the significance of emotional changes during middle to late childhood.

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